A criminal complaint filed Thursday described the content of some of the DVDs, including one titled “Boy Fights XX: Late Night Party (2009)," in which young boys displayed their genitals.

Federal investigators, including the United States Postal Inspection Service, started investigating a movie production company that sold DVDs and streamed movies online. The National Center for Missing and Exploited Children’s Cyber TipLine had received more than 20 complaints about the company’s sale of child pornography, according to the criminal complaint.

Most of the movies featured young boys, the complaint said, although it did not name the company.

Keller, 56, was in the customer database, which included two addresses where DVDs had been mailed, including the Isham Student Health Center at Phillips Academy. Keller had placed 19 orders, including more than 50 movie titles totaling $2,695.

Keller was medical director of Phillips for 19 years, ending in 2011. A prestigious boarding school that dates to the 1780s, it counts both former presidents Bush among its graduates.

The prominent people who attended the school during Keller's time there include Facebook co-founder Chris Hughes, actress Olivia Wilde and King Jigme Khesar Namgyel Wangchuck of Bhutan. There was no suggestion in the criminal complaint that Keller had abused any students while at the school.

Phillips Academy, in a brief statement on its website, said it was fully assisting prosecutors and that it planned to brief the community in coming days.

More recently Keller worked as a pediatric endocrinologist at Boston Children's Hospital. The hospital said it put Keller on administrative leave as soon as it learned of the complaint.

"No complaints or concerns have been expressed by any patients or family members about the care Dr. Keller provided while he was at Children's," the hospital said in a statement.

A check of Keller's record with the Massachusetts Board of Registration in Medicine shows no criminal convictions, hospital or board discipline or malpractice claim payments in the last decade. If convicted, Keller could face between five and 20 years in prison.